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Method for calibrating wiring of differential protection of electric power system

A technology of differential protection and correction method, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of time-consuming and labor-intensive relay protection lines, high staff requirements, and achieve simple wiring analysis and technical level requirements. Reduced, easy-to-use effects

Inactive Publication Date: 2011-06-15
西安爱邦电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to solve the situation that it is time-consuming and labor-intensive to judge the wiring error of the relay protection line under manual con

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] The specific process of wiring analysis is as follows:

[0048] 1. Obtain the measured value and transformer parameters:

[0049] 2. Current conversion:

[0050] 2.1) Use the N-phase current to correct the A, B, and C-phase currents.

[0051] When the three phases are unbalanced, the N phase will generate current. Ideally, using the N phase to correct the three phases A, B, and C can make the three phases balanced. The correction process is to add the N-phase current vector to the current vectors of the three phases A, B, and C respectively.

[0052] 2.2) Calculate the balance coefficient.

[0053] Formula one:

[0054] According to the formula one has:

[0055] Then there is the second formula:

[0056] Among them, S is the capacity of the transformer;

[0057] U is the rated voltage of the winding primary side;

[0058] I is the rated current of the winding primary side;

[0059] Ie is the secondary rated current of the winding;

[0060] Nct is the windi...

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Abstract

The invention provides a method for judging and calibrating the wiring correctness of a differential protection circuit of an electric power system, which mainly comprises the following steps: judging whether the wiring is correct or not according to the converted measured value of each winding for the differential protection of a transformer; calibrating for the first time and judging; judging whether a wiring type is correct or not after finishing the calibration for the first time; calibrating for the second time and judging; generating a calibrated effective value of the current and storing a calibrated value when correctness conditions are met; and outputting an analysis result. The method provided by the invention has the advantages of good safety and high reliability, and the operation course is simple and easy to carry out.

Description

technical field [0001] The invention relates to a wiring correction method of a relay protection circuit in a power system, in particular to a method for judging and correcting the wiring correctness of a differential protection circuit in a power system. Background technique [0002] For general differential protection, it is necessary to calculate the resultant vector of each phase on the power supply side and the resultant vector of each phase on the load side. When each winding satisfies the phase angle balance, that is, the difference between phases and phases is 120 angstroms. Take 13. Embed recognition? 80 concave pure meal unloading You Lingqin Return to imitation [0003] The process of analyzing the correctness of relay protection line wiring by traditional manual methods is as follows: [0004] 1) Obtain data: obtain the current amplitude, phase data and related parameters of each winding and phase of the transformer differential protection circuit. It is ge...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 穆明建
Owner 西安爱邦电气有限公司